mysql教程 自定義主鍵步長方法
CREATE TABLE IF NOT EXISTS `useradmin` (
`id` int(4) NOT NULL auto_increment,
`username` varchar(20) default NULL,
`userpass` varchar(40) default NULL,
`logins` int(4) NOT NULL default '0' COMMENT '登陸次數',
`logintime` timestamp NOT NULL default CURRENT_TIMESTAMP on update CURRENT_TIMESTAMP,
`mid` char(1) NOT NULL default '0',
PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8 AUTO_INCREMENT=4 ;
SET @auto_increment_increment=10;
o Query OK, 0 rows affected (0.00 sec)
o
o mysql> SHOW VARIABLES LIKE 'auto_inc%';
o +--------------------------+-------+
o | Variable_name | Value |
o +--------------------------+-------+
o | auto_increment_increment | 10 |
o | auto_increment_offset | 1 |
o +--------------------------+-------+
o 2 rows in set (0.01 sec)
o
o mysql> INSERT INTO useradmin VALUES ('www.bKjia.c0m'), (NULL), (NULL), (NULL);
o Query OK, 4 rows affected (0.00 sec)
o Records: 4 Duplicates: 0 Warnings: 0
o
o mysql> SELECT col FROM autoinc1;
o +-----+
o | col |
o +-----+
o | 1 |
o | 11 |
o | 21 |
o | 31 |
o +-----+
o 4 rows in set (0.00 sec)
